/**
 * @description：获取附件后缀
 * @param {*} file 文件名称
 * @param {*} isDot 是否显示点 0: 显示 1: 不显示
 */
export const getFileType: (file?: string, isDot?: 0 | 1) => string = (file, isDot = 0) => {
  if (!file) {
    throw "file is null";
  }
  const dot = file.lastIndexOf(".");
  if (dot < 0) {
    throw "file is wrong";
  }
  let end = file.lastIndexOf("?");
  if (end < 0) {
    end = file.length;
  }
  const ext = file.substring(dot + isDot, end).toLowerCase();
  return ext;
};
